BTHome Door Contact with Tempreture and Humidiy Sensor

This is a smart door and window contact sensor that supports the BTHome protocol, and also measures temperature and humidity.
It reports real-time open/close status via Bluetooth Low Energy (BLE) and can be automatically recognized by Home Assistant through an ESPHome Bluetooth Proxy.

Built with an ultra-low-power BLE chipset and a high-sensitivity reed switch, it runs for over 1 year on just two AAA batteries (batteries not included).
Make your home safer and smarter with effortless installation and reliable performance.

Native BTHome Protocol Support
Based on the open-source BTHome v2 standard
Supports encrypted broadcasting for enhanced privacy
Plug-and-play — automatically detected by Home Assistant

Ultra-Low Power Design
BLE 5.0 technology with broadcast current of only a few milliamps
Deep sleep current as low as 6 µA
Runs 1–2 years on two AAA batteries

Reliable Magnetic Detection
Fast response, open/close detection latency < 100 ms
Strong anti-interference performance, works with all door materials

Temperature & Humidity Sensing
Built-in SHT40 digital sensor reports accurate ambient conditions
View real-time readings in Home Assistant dashboards
Ideal for climate monitoring in rooms, cabinets, or storage areas

Easy Installation
Pre-applied 3M adhesive for quick mounting
Ideal for doors, windows, drawers, mailboxes, and cabinets

Ideal Use Cases
Home security monitoring for doors and windows
Smart lighting automation (e.g., lights on when door opens)
Refrigerator or freezer door alerts
Office or storage cabinet tracking
Environmental monitoring for temperature and humidity

Specifications

Wireless Protocol Bluetooth Low Energy (BLE 5.0)
Protocol Standard BTHome v2 (encrypted)
Transmission Type BLE broadcast
Detection Method Magnetic reed switch
Response Time        < 100 ms
Temperature Range –40 °C ~ +60 °C
Power Supply        2 × AAA batteries (not included)
Standby Current        < 6 µA
Broadcast Interval 1 minute
Battery Life         Approx. 1–2 years
Sensor Dimensions 72 × 26 × 19 mm
Magnet Dimensions 40× 15 × 15 mm
Mounting Method 3M adhesive
Material                Flame-retardant ABS, matte white finish

Encryption Key：48656C6C6F204254486F6D65210D0A00

It is strongly recommended to use an ESPHome Bluetooth Proxy with Ethernet for best stability.

Add the following configuration in your ESPHome setup:

esp32_ble_tracker:
scan_parameters:
interval: 320ms
window: 320ms
active: true

bluetooth_proxy:
active: true